/*
 jChecs: a Java chess game sample 

 Copyright (C) 2006-2011 by David Cotton

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package fr.free.jchecs.ai;

import fr.free.jchecs.core.Move;
import fr.free.jchecs.core.MoveGenerator;

/**
 * Moteur d'IA se limitant à choisir au hasard l'un des coups possibles.
 * 
 * @author David Cotton
 */
final class RandomEngine extends AbstractEngine {
	/**
	 * Instancie un nouveau moteur IA aléatoire.
	 */
	RandomEngine() {
		super(1, 1, 1);

		setMoveSorter(new StaticMoveSorter());
	}

	/**
	 * Corps de la recherche du "meilleur" demi-coup pour un état de
	 * l'échiquier.
	 * 
	 * @param pEtat
	 *            Etat de l'échiquier.
	 * @param pCoups
	 *            Liste des mouvement initiaux valides.
	 * @return Mouvement trouvé.
	 */
	@Override
	protected Move searchMoveFor(final MoveGenerator pEtat, final Move[] pCoups) {
		assert pEtat != null;

		final int l = pCoups.length;
		assert pCoups.length > 0;
		addHalfmove(l);
		final Move res = pCoups[RANDOMIZER.nextInt(l)];

		assert res != null;
		return res;
	}
}
